Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung dung
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
trinh va » trinh van, trinh vat, trinh ve
than sao » than so, than vao, thanh san
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu qua - canh trinh va ((nhung huong) OR (nhung cong)) dan ((than sao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu qua - canh trinh va ((nhung huong) OR (nhung cong)) dan ((than sao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu qua - canh trinh va ((nhung huong) OR (nhung cong)) dan ((than sao) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ho hieu qua - canh trinh va ((nhung huong) OR (nhung cong)) dan ((than sao) or (toan cao))*.